Tapping machine



Aug. 23, 1927. n1,640,105

H. S. BERGEN TAPPING MACHINE Filed July 28. 1921 3 Sheets-Sheet 1 IIIIIIIIIIIIIIIIII "fg: Us Immun.

JIIIIIIU PE1- i.

r--m-u- HagEY .5I BER GEII' Aug; Z3, 1927.

` 1,640,105 H.. s. BERGEN l TAPPING ummm Filed July ze. 1921 A s sheets-sheet 2 HARRY BERGEN Aug. 23,1927.

H. s.' B Egp I uAHIN Filed July 28. 1921 unwe- 3 Sheets-Sheet 3 withdrawn.

Patented Aug. 23, 1927.

UNlTED STATES PATENT OFFICE.

HARRY S. BERGEN, OF TOLEDO, OHIO, .ASSIGNOR TO TOLEDO SCALE COMPANY, 'OF TOLEDO, OHIO, A CORPORATION OF NEW JERSEY.v

'TAPHNG MACHINE.

' Application mea July/2s,

This invention relates to machinesy lfor tapping or threading nuts or other apery mounted upon a frame 1 which-is of shelltured articles of regular size and shape, and is particularly adapted for use in re-tapping or re-threading nuts, the threads v`of which have become battered by use or have become clogged with rust or other matter.

@ne of the objects of the invention is the provision of improved means for selecting and feeding the nuts one by one from `a supply in a hopper and successively bringing them into position to be threaded by a screw tap. Y Y Y' Another object is the provision of vautomatic mechanism for moving the threading tap into the nut and withdrawingl it V'there A from after the threading operation has been completed.

Another object isthe provision of means for automatically removing the nut from the device in which itr was held while being threaded and transferring it to a suitable'receptacle after the threading taps have been `Another object is to provide means'for removing the rough'edges o r burrs Vwhich appear during the threading operation.

Still another object isl tov 'provide a fma-f chine which is entirely automatic in 'itsoper- "l ation and of compact and fool-proof construction. l

Other objects and advantages will be apparent from the following description, Vin which reference is had to the accompanying drawings illustrating a Lpreferred embodiment `of myinvention and wherein similar reference numerals designate similar parts throughout the severalvie'ws.

In the drawings Figure 1 is a side elevational view ofa. nut

tapping machine embodying my invention;

Figure 2 is a. reverse side elevation of the machine, parts being broken out;

Figure 3 is a longitudinal vert'cal section through the machine; .f Figure 4 is an enlarged detail View of the nut agitating and feeding device;

Figure is an end elevation of the machine, the nut agitating device being shown in dotted lines; I I

Figure 6 is an enlarged fragmentary detail, partly inl section, on the line 6 6 of Figure 5; and

Figures? is an enlarged fragmentary elel! vatiorn with parts'broken away, showing the 1921'. serial no. 488,107;

burr removing and discharging mechanism. The working parts of my invention 'are like'coi'istruction so as to suitably house the parts containedtherein. Rigidly mounted -upon one end of the frame 1 is a hopper 2 a substantially rectangular chute- Ylilre member extending downwardly from its lowerend. The Vchute-like member slidably receives a pair of bars 3, Ythe upper extremi- "ties ofwhich are beveled inwardlyjto4 facilitate the entrance of the nuts into a vertical slot 5 which is formed by reason ofthe bars being spaced apart a distance substantially equal to the width of the nuts to bef tapped. f The lower ends of the'spaced bars aire secured toa. transversely extending cross head 4 and a connectingrod 6 is pivotallyattached to the'cross head by means of awrist 'pin.7, the lower end of the connecting rod 'being connected to a disk 8 by means of-a crank pin 9. The disk 8 is'iXed' t0 a horizontalshaft 10 which extends longitudinally adjacent the bottom of the framel so that when the shaft 10 is rotated'a reciprocatory motion is imparted to thebars` 3v through Ythe medium of the connecting rod 6. This movement of the bars 3 agitates the contents of thefhopper and causes the nuts contained therein fto feed 'downwardly through the Slots. 1.1

Mounted upon the opposite v'endiot' the frame 1 in'journal brackets'll is alaterally `extending shaft 12 rigidlyv secured to one end of which is a pulley 13 adapted to be vdriven through the medium of the belt 14 fromany suitable'source ofv power (not shown). Positioned upon the shaft 12 so as to be rotatable therewith is a worm 15 which meshes with a worm wheel 16 keyed or otherwisev 'fxedly secured to a horizontally' extending shaft 17 which lies substantially in the longitudinal center of the frame 1. `By employing this type oftransmission Ythe Vspeed of the shaft17 is greatly :reduced as shaft" 12.v A

The shaftl' is journalled at each end'of the frame, 'as vat'18 and 19, and mountedl vthereon so as to rotate with the shaft is 'wdlyturned'flat faces?) on la iinb 26.-

V `;ompared to the relatively high speed of the l le rlhe engagement of these flat faces serves to prevent rotation of the shaft 24 to which the kblock 25 is fixed. The member 26 is slidably mounted upon the frame 1 in adjustable beveled ways 27. The shaft 24 is mounted at each end in adjustable bushings 27 positioned in downwardly depending bosses 28 of the slidable member 26, and intermediate the bushings 27 and the block 23 lare positioned a pair of expansive springs 29, the expansive force of which may be varied by shifting the positions of the bushings 27 within the bosses 28. The bushings 27 may be secured within the bosses 28 by means of setscrews so that they may be readily shifted when desired.

As the grooved cam 2O rotates the'shaft 24 is shifted back and forth and this movement of the shaft is communicated through the springs 29 to the slide 26. Rotatably mounted in suitable bushings carried by the slide 26 is a pair of aligned hollow shafts 3 4 and 35, the adjacent ends of which are integral with clutch members 31 and 32, and rotatably mounted within the hollow shafts 34 and 35 is a shaft 30 carrying a. bevel faced clutch member 33 which is splined to the shaft 30 intermediate the clutch members 31 and 32. The clutch members 31 and 32 have internal conical faces which may be selectively brought into frictional contact with the bevel faced clutch member 33 by means to be hereinafter described. Y

The hollow shafts 34 and 35 are rotatably mounted in suitable bushings 36 and Ywithin which they are free to turn, and the shaft 3() is free to turn within the hollow shafts 34 and 35 except when it is clutched to one of the clutch members 31 and 32. Fixed upon the hollow shaft is a spacing collar or guide 39, and fixed to said collar is a pinion 40 which meshes witha spur" gear 41, the hub of which is loosely splined upon a hollow shaft` which forms the elongated hub of the spur gear 42, the function of which will be hereinafter set forth. The spur gear 41 is also provided with an elongated hub and integral with this hub is another spur gear 43 of relatively small diameter. The gear 43 meshes with an intermediate transmission gear 44 which is rotatably mounted upon a stub shaft 45 carried by the frame 38. The gear 44 in turn meshes with the pinion 46 which is keyed or otherwise tixedly mounted upon the hollow shaft 34 whichl The mechanism carried by the slide 26, being located above the main portion of the frame 1, is not housed thereby, but protected by a sheet metal cover 49 which is attached to said slide by cap screws 50. Fixed upon one end of the shaft 12 is a spiral gear 51 meshing at right angles wi Vh a similar spiral gear 52 mounted upon a longitudinally extending shaft IThe shaft 53 is journalled in bearings in bosses 54 which projectl laterally from the walls of the frame 1. The shaft 53 carries a gear 55 keyed or fixedly secured thereon which meshes with the gear 42. rlie clutch members 31 and 32 are, therefore. driven from the shaft 53 through the gears 55, 42, 41, 4 3, etc.

The gear 42 is mounted upon a pair of bushings 56 which are rotatable upon the shaft 17. It will be understood from the 1" foregoing that the shaft 17 is permitted to rotate independently of the gear 42. the bushings 56 and the gears 41 and 43. The

shaft thus performs the double function ofk a support for the gears 41 and 43 and a power shaft which drives the cylindrical cam 2O and other mechanism to be hereiir' upon the short shaft 59 meshes with a spur ,L gear 61 which is fixedly secured to a. gear wheel 62 that is mount-ed to rotate with the shaft 17. The gear wheel 62 meshes with a pinion 63 which is keyed to the auxiliary shaft 10.

In the operation of the machine a quantity of nuts is placed in the hopper 2 and the mechanism is set in motion by means of the belt 14. The shaft 12, being rotated, turns the worm 15, the worm wheel 16, shaft 1 7, cylindrical cam l20 and gear wheel 62. The gear wheel 62 drives the pinion 63, thus rotating the shaft 10 whereby a vertical reciprocatory motion is imparted to the bars to agitate the nuts in the hopper. By reason of this agitation the nuts will be shaken into the space between the bars3 and will pass downwardly in the slot 5 until the lowermost nut in the series engages the face of the positioning stop 66. Concurrently with the operation outlined above the groove 21 of the rotating cylindrical cam 20 acts upon the roller causii'ig the block 23.shaft 24 and member 26 to move forwardly.' At the same time the spiral gear 51 meshing with the gear 52 causes the latter and the shaft 53 to rotate. The gear 55 drives the gear 42. the latter in turn acting through the gear 41 to drive the gear 40 and thus rotate the clutch member 32 in a clockwise direction. The gear 43, being integral with the lil) l fill gear 41, rotates in the same direction, but the transmission gear 44, being disposed between the gear 43 and the gear 46, the 4:6 and the clutch member 31 are caused to rotate in a coimterclockwise direction. 'he shaft 30 and the bevel faced clutch member are normally idle, but when the slide 2G..which carries this mechanism is move-d forwardly by the roller 22 as acted upon by the groovev 21 of the cylindrical cam 20, the threading tap 48 is brought into contact with one of the nuts, which` has tellen. un a position in the slot 5 above the block 65. The longitudinal movement of the shaft 30 and the clutch member 33 is checked by the engagement ot the threading tap with the nut, and upon continued forward movement oi the slide 26 onebeveled face of the clutch member 33 contacts with the conical face of the clutch member 32 which is rotating'in a clockwise direction. The clutch member 33, shaft 30 and tap 48 are thus turned and the tap is threaded into the nut. l

The block 23 and shaft 24 move forwardly a short distance after movement of the shaft 30, the clutch and the slide has been checked, thus compressing the springs 29. pansive force of the springs thereafter exerts the necessary pressure on the threading tap to hold the nut in place and forcer the tap into the aperture. As theV change in the direction of the slot 21 causes the roller 22 and shaft 24 to move rearwardly, this pressure decreases until at Vabout the time the tap has been passed a suliicient .distance through the nut the pressure is entirely relieved. The slide 26 and the clutch members 33 and 31 move rearwardly until the member 32 is disengaged from the bevel edged member 33 and the member 31 is engaged ltherewith. The shaft 30, clutch and slide 26 continue to move rearwardly with the roller 22, thus pulling the nut from its position in the lower end of the slot 5 into an adjacent passage 67. The rearward movement of the shaft 30 and the clutch and slide 26 is arrested by engagement ot the nut with the rear face 68 oi' the passage 67 and the rear spring 29 put under compression by the continued movement ot' the block 23 as actuated by the cam slot. By reason of the engagement ot the clutch members 31 and 33 the shaft 30 is meanwhile being turned in a direction to unscrew the tap from the nut, and. as soon as the tap is free of the threads, the slide 26 and parts carried thereby move under the influence of the compre-seed spring 29 to completely withdraw the tap from the aperture in the nut, so that the nut is allowed to tall through a chute 69 into a rec ss 70 in the periphery of the i disk 58. Rotation of the disk 58 carries the nut between the burring mills or cut-ters 57, thus removing any rough or burred edges which may have ,developedv during the threading operation. By' continued rotation of the disk 58 the'nut is pern'iicted to fall through an opening 71 in the heus.

7 2 into any suitable receptacle (not shown).

It will be understood that the slot 5 kept iilled to that it acts as a magazine, and as '.foon as one nut. is moved 'trom the position fulfill' the objects primarily stated, it is to 7' be understood that the invention is'su'sceptible to variation, modification and change within the spirit and Scope of the subjoined claims. y

Having described my invention, I claim:

1. In a device of the class described, in combination, a magazine adapted to Vcontain a row of articles to be tapped, there being passage adjacent said magazine, a threading tool, means for moving said threading tool through said passage and into engagement with an article in said magazine, means for turning said threading tool, means for retracting said threading tool a'nd'thereby moving said article from said magazine into said passage, means for reversing the direction of rotation of said threading tool, and means for removing the burr due to the threading operation from said article.

2. In a device of the class described, in combination, a frame, a reciprocatory carrier mounted thereon, a pair of oppositely revolving clutch members carried by said carrier, an intermediate clutch member carried by said carrier, a threading tool connected to said intermediate clutch member,

means for moving said carrier forwardly to bring said tool into engagement with an article to be threaded, the parts being so arranged that said intermediate clutch member is brought into engagement with one of said oppositely revolving clutch members when said tool engages the article to be threaded, and meansfor moving said carrier in the opposite direction, the parts being so arranged that the intermediate clutch member engages the other of said oppositely revolving clutch members when the car-V rier is moved to withdraw said tool from the article which has been threaded, said carrier moving means including a resilient lost motion connection.

3. In a device of the class described. in combination, a magazine adapted to contain a, row of articles to be threaded, there being a passage adjacent said magazine, a reciprocatory carrier, a threading tool supported by said carrier, a pair of oppositely revolving clutchmembers carried by said carrier, an intermediate clutch member connected to said tool, means Yfor moving `said carrier tor- Wardly to bringsaid threading tool into engagement with one of the articles in said magazine, the parts being` so arranged that the intermediate clutch member is engaged with one ot said oppositely revolving clutch members when said tool engages said article, and means operative after the threading operation to move said carrier rearwardly and thereby move said article trom said magazine to said passage, the parts being` so arranged that said intermediate clutch mem-4 ber is engaged with the other ot said oppositely revolving clutch members when said article is moved into said passage.

fl. ln a device of the class described, in combination, a magazine adapted to contain a row of articles to be threaded, there being a passage adjacent said magazine, a reciprocatory carrier, a threading tool supported by said carrier, a pair et oppositely revolving clutch members car ied by said carrier, an intermediate clutch member Connected to said tool, means for moving said carrier forwardly to bring said threading tool into engagement with one of the articles in said magazine, the parts being so arranged that the intermediate clutch member is engaged with one of said oppositely revolving clutch members When said tool engages said article, means operative after the threading operation to move said carrier rearwardly and thereby move said article from said magazine to said passage, the parts being so arranged that said intern'iediate clutch member is engaged with the other of said oppositely revolving clutch members When said article is moved into said passage, and spring means interposed between said carrier moving means and said carrier to form a resilient lost motion connection. V

HARRY S. BERGEN. 

